Fbancis davidson



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F. DAVIDSON.

Step Bearing for Vertical Shafts.

N0. 240,100. y 'Patented Apr112,1881.

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'Nrran STATES FATENT Finca.

FRANCIS DAVIDSON, OF CRYSTAL CITY, MISSOURI.

STEP-BEARING FOR VERTICAL SHKAFTS.

SPECIFICATION forming part of Letters Patent No.A 240,100, dated4 April12, 1881.

Application filed January 22, 1881.

To alt whom it may concern:

Beit known that I, FRANCIS DAVIDSON, of Crystal City, in the county ofJefferson and State of Missouri, have invented a certain new and usefulImprovement in Step-Bearings for Vertical Shafts, of which the followingis a full, clear, and exact description, reference being had to theaccompanying drawings, forming part of this speciication.

My improvement consists in the hereinafter.- described removable bearingintended especially for heavy vertical shafts for various purposes.

In the drawings, Figure l is a side view of the improvement. Fig. 2 is asection at x, Fig. 4. Fig. 3 is a horizontal section at m x', Fig. 2,with plan of parts below the sectionline. Fig. 4. is a horizontalsection at x2 x2, Fig. 2, with plan of parts below the section. Fig. 5is an enlarged detail section of the lower end of the shaft at w x, Fig.4, showing the bearing-block in position in the central socket of theshaft; and Fig. 6 is a similar section,showing this blockloosenedin thesocket.

A is the step casting, made with a socket to receive the lower end ofthe vertical shaft B, and an oil-chamber, C, closed by a plate, D, heldin place by bolts d. The joint \be tween the plate D and the casting ismade oil-tight, so that the chamber C may be kept full of oil.

d is a plug fitting in a hole in the plate D, through which hole the oilmay be drawn from the chamber C.

The lower end of the shaft B has an axial socket, b, which may becylindrical for most .of its length, and Whose lower part, b', isflaring or conical, and in this part b' fits tightly the frusto-conioaltop e of the hearing-block E. The lower part, e', of the bearing-blockmay be cylindrical in form, and may be of larger diameter than theconical part e. The bottom of the bearing-block E turns upon the fixedstep-block F, which is made angular at its lower part, f', and tit-ssnugly in a recess of the step-casting to hold it in place. The upperpart, f, of the step-block may be cylindrical, as shown, and of diametersimilar to the part e of the step-block, more or less.

The plate or gateD has projections D bear- (No model.)

ing against the outer side of the step-block F, to prevent its outwardmovement.

The top of the step-block F has an oil channel or groove, c2, to conductthe oil inwardly to the bearing-surfaces between the blocks E and F.

The shaft-socket b in the step-casting Ahas a number of recesses toreceive side bearingblock, G, whose inner sides are made to f1t theshaft. The top of the step-casting extends outward in a flange, a, togive bearing for jacks to lift the shaft when removing the hearing-blocks. The upper ends of the jacks have bearing beneath a flange, b3,surrounding the shaft B.

The cylindrical (upper) portion of the socket b contains a drift-block,H, made to t freely in the socket, the purpose of whichi is to force thebearing-block E downward and loosen it in the socket to allow it Atodrop to the bottom of the chamber C, when the step-block F has beenremoved through the mouth a', when the gate D has been taken away. Thedrift-block His forced down for the said purpose by a wedge, I, whichextends through a diametric mortise, b2, in the shaft, and which restsin a key-seat, h, of the block. To limit the descent of the drift-blockH the block has a diametric hole, h', through which is passed a bar, J,extending through the mortise b2. Thus the bar J sustains thedrift-block H in the absence of the block E and when in its lowerposition, as seen in Fig. 6.

j"2 is a hole for the insertion of the claw of a pull-rod, by which theblock F is drawn ont of the chamber C.

Iprefer to forni the lower end of the driftblock H with a diametric rib,h2, which enters a groove in the top of t-he bearing-block E, so as tohold them in their relative positions. By means of this connection and akey, I, the block E might be prevented from turning in the conicalsocket b' when not lit-ted in tightly.

It will be observed that by simply removing the pressure ofthe shaftfrom the step-block Fit can be taken out, and that the bearingblock Ecan then be forced out of its socket and drawn out ofthe oil-chamber.These blocks can then be readily lined'up and returned and the jacksremoved from between the lianges c IOO and b3, allowing the shaft; todescend upon the 2. The combination, with a vertical shaft, 1o blocks.of the removable step-bearing blocks and the I claim as myinventionstep-casting containing oil-chamber G, closed 1. Thedrift-block H and key I, in combnaby removable gate D, substantially asset forth. 5 tion with the bearing-block E and shaft B,

formed with socket b and mortse b2, the said FRANCIS DAVIDSON' blockbeing located in the seid socket b, and Witnesses: the said keyextending through the said mor- SAML. KNIGHT,

t-ise, as set forth. GEO. H. KNIGHT.

